My online persona is far more outgoing than the physical me. Maybe not quite as much these days, but I used to make quite a few new friends with ICQ back in the day. Nowadays I see my best friend two or three times a week (Sunday at church, Bible study evening, and our church's young people group evening). I look forward to hanging out with him and other young people in the gang, but I don't go out of my way to attend social events too quick. I am quite happy to be by myself and draw, make music, write, read, etc.
It is kinda weird though because when I am with people I am familiar and comfortable with (like my family, cousins, or young people group) I am fairly loud and try to draw some attention to myself. But at the office where I work I am teased that I am so quiet. I'm not very outgoing at conferences either - I pretty many only hangs with people I know. In that setting I'm not adverse to getting to know new people but I take very little initiative.
So I don't look for social events but if I do go to one and am comfortable there I can get loud and energetic. Hey, I'm a paradox! ß-)